Dynamic balancing-machine.



N. W. AKIMOFF.

DYNAMIC BALANCING MACHINE. APPLICATION FILED MAR. 31, 1916. RENEWED JULY6, I918.

1,296,607. Patented Mar. 11, 1919.

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wane/000a v gnvamtoz mm 01w zJ/mmy UNITED STATES PATENT OFFICE.

- NICHOLAS W. AKIMOFF, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, T0 DYNAMIC BALANCING MACHINE COMPANY, OF PHILADELPHIA,

PENNSYLVANIA.

DYNAMIC BALANCING-MACHINE.

Patented Mar. 11, 1919.

Application filed March 31, 1916, Serial No. 87,926. Itenewed July 6,1918. Serial No. 243,699.

1 0 all 'iuhom it may concern Be it known that I, NICHOLAS \V. AKI-MOFF, a subject of the Czar of Russia, and a resident of the city ofPhiladelphia, county of Philadelphia, and State of Pennsylvania, haveinvented certain new and useful Improvements in DynamicBalancing-Machines, of which the following is a full, clear, and exactdisclosure.

The object of the invention is to provide a simple apparatusautomatically operative to positively indicate the absence of dynamicbalance in a rotatable body of any sort, but with particularadaptability to such objects as fly-wheels, pulleys, etc., havingrelatively less axial extent than diametrical measurement.

Another object is to provide a device of this character whereby elementsof the same forming a mechanical couple are so shifted, while the saiddevice is in motion, as to move an axis of the momental ellipsoid ofinertia of a body being tested into coincidence with the axis ofrotation of the said body.

Still another object is to provide a con struction, wherein thedisturbing couple of a dynamically unbalanced body is neutralized by aset of mechanically adjustable elements forming a second couple, whilethe system comprising said body and said elements is in rotation. v

And a still further object is to provide means for directly indicatingthe relative position and numerical value or equivalent of thedisturbing couple within said unbalanced body.

(This invention and application comprise a further step in thedevelopment ofdynamic balancmg apparatus considered also in copendingapplications, Serial Nos. 32,296, 36,573 and 59,659.)

Further details as to the preferred construction and operation of theinvention are fully brought out in the following descrip- 1 tion inconjunction with the accompanying drawing inwhich one embodiment of theinvention is shown in elevation with parts thereof in section.

Referring to the drawing, a base 1 is shown upon which is mounted atable 2, pivotally supported by one or more members 3, each resting upona point or knifeedge 4 and adapted tov oscillate in a vertical.

plane, the saidtable being further supported by one or more resilientmembers 5 having predetermined natural periods of vibration under givenloads.

Centrally the table 2 is provided with a recess 6 preferably lined witha bearing 7 and in alinement with which is a centrally apertured bushing8, supported by and'at the point of convergence of a suitable num- 1 andis operative-to revolve in conformity therewith by virtue of a suitablysecured key 16.; The peripheral portion of the hub 17 of said last-nameddisk is provided with a continuous groove 18 into which slidably extendsone or more pins 19 from the yoke portion of a lever 20, pivotallysupported at 21 upon on integral extension 22 of the brackets 9, and atits opposite end provided with a handle for the purpose of manuallyoperating the said lever and in turn the disk 15, the extent of themovement of said lever and disk being indicated upon the graduatedsegment 23, or other suitable means.

Fixed to the other side of the disk 12 and adjacent to the peripherythereof is a suitable weight 25, while diametrically opposite therefromand at an equal distance from the center of rotation is a second weight26 secured upon the upper side of the disk 15. This pair of weightscreates a mechanical couple, and as the lever 20 is actuated during therapid rotation of the device the ellipsoid of inertia of the mechanismis shifted with respect to the axis of rotation as the weight 26 ismoved vertically,.thereby altering its angular relation with respect tothe weight 25. y I

The body to be balanced, such for instanc as the pulley 30, is securedcentrally upon the disk 12, preferably by means of a bolt or the like31, an intermediate rest or bearing 32 being interposed when necessarybetween said body and said disk. Said body and supporting mechanism arethen set into rotation by the electric or other motor 35, or similardriving mechanism through the upon the said body creating a disturbingmechanical couple, is neutralized by raising or lowering the lever, thusshifting the lower disk and weight secured thereto, which with theweight upon the upper disk creates a Second couple. Now, if thediametrical line passing through the controlling elements of said secondcouple is at the beguiningin a plane angularly parallel with the saiddisturbing couple,-the effect of the latter'will be neutralized and thenumerical value of the same indicated upon the graduated segment, afterwhich additions to, or subtractlons from, selected portions of theunbalanced body can be readily made to perfectly balance the samedynamically. If, however, the

desired result is not fully attained by the adjustment-described, themechanism is stopped and thebody being testedis shifted axially upon itssupporting disk as much or as many times as may be found necessary,until the cause of the unbalanced condition of the body as evidenced bythe vibrations of the device is fully neutralized.

4 Having thus described my invention, what. I claim and desire toprotect by Letters Patent of the United States is 1. A dynamic balancingmachine, comprising a pair of dlsksrotatable upon a common axis, onebeing axially movable with respect to the other, means to revolve saiddisks synchronously, and equal weights secured to the respective disksand creatinga couple adaptw ed to neutralize the disturbing couple in abody rotatably supported by said machine.

2. A dynamic balancing machine, comprising apair of disks rotatable upona common axis and one movable axially with respect to theother, means torevolve said disks synchronously, and equal weights secured to Ydiametrically opposite positions upon said disks, and creating a coupleadapted to neutralize the disturbing couple'in a body rotatablysupported by said machine.

3. A dynamic balancing machine, compris- I ing a shaft, a disk carriedby said shaftand adapted to support a body to be tested, a second disklongitudinally adjustable upon said shaft but revoluble therewith, andequal weightssecured to said disks to create a mechanical couple adaptedto neutralize the disturbing co pl of said body.

4. A dynamic balancing machine, comprising a shaft, ad-isk carried bysaid shaft and adapted to support a body to be tested,

-a second disk longitudinally adjustable upon said shaft but revolubletherewith, equal weights secured to the diametrically opposite sides ofsaid disks to create a mechanical couple adapted to neutralize thedisturbing couple of said body, and means to adjust the respectivepositions of said weights while'the system comprising said disks. andsaid body are rotating.

5. A dynamic balancing machine, comprising a support for a body to betested, a pair of equal weights revoluble about a common axis, said axislying in the same plane with the axis of said support, means connectingsaid weights and said support and operative to revolve themsynchronously, the plane of.

movement-of one of said weights being fixed,

and means to move the plane of movement of the other of said weightsinto and out of coincidence with the said first plane.

6. A dynamic balancing machine, comprising a sup-port for a body to betested, a pair of equal weights revoluble about a common axis, said axislying in the same plane with the axis of rotation of said support, meansconnecting said weights and said support and operative to revolve themsynchronously, the plane of movment of one of said weights being fixed,and means to shift the plane of movement of the other of said weightsinto and out ofcoincidence with the said first plane, while the systemformed by the weights and body is rotating.

7. A dynamic balancing machine, comprising a sup-port for a body to betested, a pair of disks revoluble upon coincident axes and axiallymovable with respect to each other, each disk being provided with aweight diametrically disposed with respect to the weight of the other,and means connecting said: disks and operative to revolve themsynchronously with said support.

8. A dynamic balancing machine, comprising a support for a body to betested, a pair of disks revoluble upon coincident axes and

